with two frightening incidents at los angeles international airport, they happened almost simultaneously, one at terminal 4, the other at terminal 5. at terminal 4, a prank call to police caused this chaotic scene. authorities say it all began when the caller reported a gunman at the airport and that prompted this response from police. >> everyone on the ground! everybody get down! >> police evacuated the terminal, didn't find anything suspicious, gave the all clear almost at the same time. at terminal 5, an suv crashed, triggering a panic reaction from passengers inside. paul vercammen has more. >> reporter: last night, absolute panic at lax. what happened, this driver of a minivan collided with parked cars and hit a parking structure here. someone mistook the sounds of the collision for gunfire. and as you also pointed out, there's what police are determining a prank call to another terminal saying there's a man with a gun inside. police came rushing into both terminals, guns drawn, and basically you can imagine the passengers here absolutely scared out of their minds as this went on.